18613648 has 10 divisors (see below), whose sum is σ = 36063974. Its totient is φ = 9306816.

The previous prime is 18613633. The next prime is 18613649. The reversal of 18613648 is 84631681.

It can be written as a sum of positive squares in only one way, i.e., 14500864 + 4112784 = 3808^2 + 2028^2 .

It is not an unprimeable number, because it can be changed into a prime (18613649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 581661 + ... + 581692.

Almost surely, 2^18613648 is an apocalyptic number.

It is an amenable number.

18613648 is a deficient number, since it is larger than the sum of its proper divisors (17450326).

18613648 is a wasteful number, since it uses less digits than its factorization.

18613648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163361 (or 1163355 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 18613648 is about 4314.3537175341. The cubic root of 18613648 is about 265.0190943878.

The spelling of 18613648 in words is "eighteen million, six hundred thirteen thousand, six hundred forty-eight".